Bug 21404

Summary:

[830M] dithering not enabled correctly

Product:

xorg

Reporter:

Jaakko Oranen <aakko>

Component:

Driver/intel

Assignee:

Jesse Barnes <jbarnes>

Status:

RESOLVED FIXED

QA Contact:

Xorg Project Team <xorg-team>

Severity:

normal

Priority:

medium

Keywords:

NEEDINFO

Version:

unspecified

Hardware:

x86 (IA32)

OS:

Linux (All)

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
Xorg.0.log	none
dmesg	none
xrandr output	none
xorg.conf	none
vbios	none

Description Jaakko Oranen 2009-04-25 08:00:29 UTC

Intel-driver does not enable dithering on Dell Latitude C400. The result is that there is "banding" instead of a smooth transition between colors. It is especially apparent when there is any kind of gradient on the screen.

The problem is probably that the C400 has 6-bit LCD-panel and Intel-driver doesn't probe the panel properly. The driver doesn't know that the dithering should be enabled for this panel.

Comment 1 Jesse Barnes 2009-04-28 18:43:15 UTC

I'll need some logs (dmesg, X log and other info requested in http://intellinuxgraphics.org/how_to_report_bug.html), but it may be a a dup of #21446 if you're using KMS.

Comment 2 Jaakko Oranen 2009-04-30 07:24:46 UTC

Created attachment 25305 [details]
Xorg.0.log

Comment 3 Jaakko Oranen 2009-04-30 07:25:49 UTC

Created attachment 25306 [details]
dmesg

Comment 4 Jaakko Oranen 2009-04-30 07:26:20 UTC

Created attachment 25307 [details]
xrandr output

Comment 5 Jaakko Oranen 2009-04-30 07:27:06 UTC

Created attachment 25308 [details]
xorg.conf

Comment 6 Jaakko Oranen 2009-04-30 07:40:48 UTC

Distribution: Arch Linux
Kernel: 2.6.29.1
Xorg version: 1.6.1
Intel-driver version: 2.3.2
libdrm version: 2.4.9
DRI-driver version: 7.4

Comment 7 Jaakko Oranen 2009-04-30 11:15:36 UTC

Created attachment 25315 [details]
vbios

Comment 8 Jesse Barnes 2009-06-23 17:25:09 UTC

Does this still happen on more recent versions?  AFAICT we set the dither bit on all DVO attached panels, so please re-open if it still fails with the 2.7.1 driver for example (or file a new bug if you see a different issue).

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